staging: ccree: fix boolreturn.cocci warning

This fixes the following coccinelle warning:
WARNING: return of 0/1 in function 'ssi_is_hw_key' with return type bool.

return "false" instead of 0.
Signed-off-by: Suniel Mahesh <sunil.m@techveda.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ccree/ssi_cipher.h

@@ -75,7 +75,7 @@ struct arm_hw_key_info {
 
 static inline bool ssi_is_hw_key(struct crypto_tfm *tfm)
 {
-	return 0;
+	return false;
 }
 
 #endif /* CRYPTO_TFM_REQ_HW_KEY */